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L. H. ALLEN.

TRIMMING ATTACHMENT FOR SEWING MACHINES. No. 246,859. Patented Sept. 13,1881.

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L. H. ALLEN.

TRIMMING ATTACHMENT FOR SEWING MACHINES. No. 246,859. Patented Sept. 13,1881.

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UNTTED Sterne ATENT OFFICE.

LESTER H. ALLEN, OF FARMINGTON, NEV HAMPSHLRE.

TRIMMING ATTACHMENT FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 246,859, dated September 13, 1881.

Application filed July 11,1881. (No model.)

To all whom it may concern:

Be it known that I, LESTER H. ALLEN, of Farmington, county of Straftord, State of New Hampshire, have invented an Improvement in Edge-Trimming Attachments for Sewing-Machines, of which the following description,in connection with the accompanying drawings, is a specification.

This invention relates to an improved trimming attachment for sewing-machin es wherein the trimming knife or blade may be instantly thrown into or out of operative position and relation to the needle-bar. The blade-carryin g bar is actuated positively independently of the needle-bar, and is adapted to slide in a horizontally-movable guide, which, by its change of position, places a pin on the blade-carrying bar either into the open notch of astationary fork or into the open mouth of a fork at the end of a vibrating arm deriving its movements through a rock-shaft from a link and an eccentric on the needle-bar-actuating shaft.

This invention is an improvement on that shown in my application No. 32,275, filed April 21, 1881, to which reference may be had.

Figure 1. represents a rear side elevation of a sewing machine embodying my invention; Fig. 2, a detail showing a top view of the horizontally-vibrating lever at the top of the machine and the guide for moving the bladecarrying bar laterally; Fig. 3, a front view of the head of the machine with the blade-carryin g bar thrown outof operative position Fig. 4, a similar view with the blade-carrying bar in operative position; Fig. 5, a partial rear side elevation and section of Fig. 1, to show the three-armed lever which moves the horizontal lever at the top of the machine; and Fig. 6, a sectional detail on the dotted line as m, Fig. 1.

The machine selected upon which to illustrate my invention is that known as the G. F. No. 2, made by the Weed Sewing Machine Company. Upon the upper side of the arm of this machine I have pivoted the lever A, which, at its rear end, is provided with an adjustable loop, (I, having a hole, (L to receive the upright arm of the three-armed lever I), pivoted at 11 (See Figs. 1 and 5.) This lever has legs b b pivoted at the ends of its short arms, which are extended downward through the shifting block 0, made horizontally movable by the hand-lever c and spiral spring 0 The link d, which is connected with the crankarm d and actnates the needle-bar-operating rocker-shaft 0?, all as usual, has a striker, d, which, as the link rises, will strike the notched lower end of that one of the legs I) or b which is in line with it, according to the position of thehaud-lever c and guide 0, moving the threearmed lever in one or the other direction on its pivot b the three-armed lever also moving the lever A in one or the other direction. With the parts in position Fig. 1 the blade-carrying bar will be as in Fig. 4.

The front end of lever A is forked, as at a Fig. 1, to embrace or engage a notched collar, 6, on the slide-rod e, fitted in the bearing 6 and having at its other end the guide 6 which receives and guides the upper portion of the blade-carrying barf, it being provided at its lower end with the blade-holder w and cutting blade or knifef The lower bearing, f for the bar f is pivoted so that it may turn axially as the said bar is changed from the position Fig. 3 to that of Fig. 4, or vice verse, by the longitudinal movement of the slide a and guide 6 The lower end of bar f is provided with a removable blade-holder, w, bentor curved backward, and secured by screw to to the lower end of the blade-carrier, as shown in Fig. 1, to bring the blade f 2 into the proper position with relation to the needle 7b of the sewing-machine,

which needle is to co-operate in making a seam in the article to be trimmed parallel with the said seam. The barfis provided at its front face with two pins, 2 3.

At the front of the head fixed a forked block, 1, having its fork open toward the bar f.

()n the shaft 61 I place an eccentric, m, which is embraced by an eccentric-strap, part of which is joined with the arm at of a rock-shaft, 121/", having at its front end an arm or crank, it, provided with an open fork, a, into which the pin 3 of the barfis thrown by the movement of the slide-rod e and guide 0 as in Fig. 4, when it is desired to operate the bar f and blade f to trim the article being sewed. This rock-shaft and arm a operate constantly, and work the bar f and blade f,

of the machine is except when the pin 2 of the said bar is thrown into the stationary fork l, as in Fig. 3, by the movement of the guide 0?. The guide 6 is shifted only when the arm or crank 'n is in its highest position, at which time the pin 2 on the barfis opposite the fork Z. In Fig. 3 the cranlr'n is shown as having been moved down alittle after the pin 2 was moved into the fork l.

The three-armed lever and the parts to actuate it are the same as in my application referred to, and are consequently not herein claimed, broadly. V

By this attachment I can stop trimming or commence to trim at any stitch, and can consequently trim very sharp or pointed scallops, the lever 0 for controlling the position of the blade or cutter carrying bar, being located near the usual fly-wheel, B, to be quickly and readily moved.

It will be noticed that the upper end of the blade-holder is forked to embrace the bladecarrierf. This holder will be removed when it is desired to grind the small blade attached to its lower end.

I claim 1. The blade-carrying bar provided with a pin and a forked arm or crank to engage the pin on and reciprocate the said bar, combined with a laterally-movable guide to place the pin of the said carrying-bar into or out of engagement with the said arm or crank, substantially as and for the purpose described.

2. The blade-carryin g bar provided with pins or projections, a stationary open fork, and a vibrating forked arm or crank, combined with a guide to move the said bar laterally to place the one or the other of the said pins into either the stationary fork or the fork of the arm or lever, substantially as described.

3. The cutting-blade, the blade-carrying bar held and adapted to reciprocate in an axiallypivoted bearing, and a horizontally-movable guide, and a vibrating forked arm or crank to at times engage and reciprocate the said bar, and a stationary fork, I, combined with a slidebar, and means to reciprocate the same to place a pin of the blade-carrying bar into engagement with either the stationary fork or the forked arm or crank, substantially as described.

4. The rotatingneedle-bar-operating shaft, its eccentric, eccentric-strap shank, and rockshaft actuated thereby, having an open forked arm at its front end, combined with a pivoted blade-carrying barau d laterally-moving guide, to hold and place the said blade-carrying bar into or remove it from the notch in the said arm, substantially as described.

In testimony whereofI have signed my name to this specification in the presence of two subscribing witnesses.

LESTER H. ALLEN. Witnesses:

BYRON P. NUTE, ERI F. NUTE. 

